# -*- coding: utf-8 -*-
# @Time : 2022/4/9 20:37
# @Author : Liuqing
# @File : 15_差异.py
# @Software : PyCharm
def difference(a, b):
    return list(set(b).difference(set(a)))


if __name__ == '__main__':
    print(difference([1, 2, 3], [1, 2, 4]))
